Fix encoding of \ in some string literals in the discussion of "raw"
strings. Reported by Lorenzo M. Catucci <lorenzo@argon.roma2.infn.it>.
diff --git a/Doc/ref/ref2.tex b/Doc/ref/ref2.tex
index e187c7a..c96031a 100644
--- a/Doc/ref/ref2.tex
+++ b/Doc/ref/ref2.tex
@@ -350,8 +350,8 @@
the string}. For example, the string literal \code{r"\e n"} consists
of two characters: a backslash and a lowercase `n'. String quotes can
be escaped with a backslash, but the backslash remains in the string;
-for example, \code{r"\""} is a valid string literal consisting of two
-characters: a backslash and a double quote; \code{r"\"} is not a value
+for example, \code{r"\e""} is a valid string literal consisting of two
+characters: a backslash and a double quote; \code{r"\e"} is not a value
string literal (even a raw string cannot end in an odd number of
backslashes). Specifically, \emph{a raw string cannot end in a single
backslash} (since the backslash would escape the following quote